Workaround: 
Edit /usr/share/pulseaudio/alsa-mixer/paths/analog-output-speaker.conf

Change [Element Front] and [Element Speaker]
;switch = mute
;volume = merge
switch = ignore
volume = ignore

you can then use alsamixer for the levels of Speaker / Headphone
Pulseaudio affects Master and PCM.
execute "killall pulseaudio" to reload config

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https://bugs.launchpad.net/bugs/870360

Title:
  [HP Pavilion dv7 Notebook PC, IDT 92HD75B3X5, Internal] Speakers not
  disabled when headphone jack plugged in

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